作者:Petra Vojáčková、David Chalupa、Jozef Prieboj、Marek Nečas、Jakub Švenda
DOI:10.1021/acs.orglett.8b03039
日期:2018.11.16
Enantioselective conjugate additions of in situ generated 2-alkoxycarbonyl-3(2H)-furanones to three distinct types of π-electrophiles (terminal alkynones, α-bromo enones, and α-benzyl nitroalkenes) are reported. Catalysis by a nickel(II)–diamine complex provided alkynone-derived adducts with high enantioselectivity, preferentially as the Z-isomers, and completely suppressed the undesired O-alkylation
据报道,将原位生成的2-烷氧基羰基-3(2 H)-呋喃酮对映体选择性共轭加成到三种不同类型的π-亲电子体中(末端炔烃,α-溴烯酮和α-苄基硝基烯)。镍(II)-二胺络合物的催化作用提供了具有高对映选择性的炔酮衍生加合物,优先作为Z异构体,并完全抑制了不希望的O-烷基化途径。基于铜吡啶的催化剂能够将对映选择性共轭加成物扩展至α-溴烯酮和α-苄基硝基烯烃。所产生的紧密官能化的加合物是螺环天然产物假单胞菌素的合成类似物的有用前体。